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Soil and Ground Water Investigation Report HERMAN & HELEN'S MARINA 15135 Eight Mile Road, Stockton, California 10. INTRODUCTION In accordance with the request of Mr Andrew Smith of Herman & Helen's Manna, Advanced GeoEnvironmental, Inc (AGE) has prepared this Soil and Ground Water Investigation Report for 15135 Eight Mile Road, Stockton, California The scope of work included advancement often soil probe borings and the collection and analysis of soil and ground water samples Currently, two 12,000-gallon above ground storage tanks are in use at the site One tank contains gasoline, the second is compartmentalized into one 5,000-gallon gasoline tank, one 3,000-gallon gasoline tank, one 3,000-gallon diesel tank and one 1,000-gallon oil tank The tanks are connected to dispensers by piping contained in a concrete-lined trench The site and the surrounding area are illustrated in Figure 1 Structures and monitoring well and sampling locations are illustrated on Figure 2 20. BACKGROUND . On 30 October 1991,three underground storage tanks(USTs)were removed from the site by Warren E Gomes Excavating, Inc Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d) and benzene, toluene, ethylbenzene and total xylenes (BTEX) were detected in soil samples collected from the UST excavation at depths between 9 feet and 12 feet below surface grade (bsg) Additional information can be found in the Condor Earth Technologies, Inc (Condor)-prepared Tank Pull Testing Results,dated 18 November 1991 Based on the contamination detected in the soil samples collected during the UST removals the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) directed the investigation of the TPH-g and TPH-d contaminated soil A brief description of previous investigations at the site are as follows • On 22 August 1995, three hydropunch soil borings (HP-1, HP-2 and HP-3) were advanced at the site TPH-g and BTEX were detected in soil and ground water samples collected from each boring • On 29 August 1996, five probe borings were advanced at the site TPH-g, BTEX and methyl-tertiary butyl ether (MTBE) were detected in the soil and ground water samples collected from the borings advanced in the northern portion of the site • On 10 September 1997, four ground water monitoring wells (MW-1, MW-2, MW-3 and MW-4) were installed at the site to investigate and monitor the lateral extent of impacted ground water TPH-g, BTEX, and MTBE were detected in the soil samples from borings MW-2 and MW-4 TPH-g, BTEX, MTBE, tertiary amyl methyl ether (TAME) and tertiary butanol (TBA) were detected in the ground water samples collected from the wells on 18